May 13th 2016, 06:49 AM
|
#2 |
Physics Team
Join Date: Jun 2010 Location: Morristown, NJ USA
Posts: 2,326
|
I'll step you through this:
1. The molecular density of H2 is 2 g/mole, so one gram of H2 is equivalent to how many moles?
2. Multiply the result of part (1) by the number of molecules in a mole. This tells you how many H2 molecules are in the balloon.
3. The balloon is 4 liters in volume - convert this to cm^3 (there are 1000 cm^3 per liter).
4. Divide the answer from (2) by the answer from (3), to get molecules per cm^3.
Post back with your answer and we'll check to make sure it's correct.
|
| |